.
. Butt. (Carp.) Term usually applied to a hinge other than a strap hinge.
Butterfly table. (Furn.) A small flat top table with supports for holding up the side wings, which resemble the wings of a butterfly.
Butter-fly valve. (Auto. Mech.) A winged damper supported on a fulcrum or shaft, movement of which controls passage of gas or air through an opening.
Buttering. (Masonry) The spreading of mortar on the edges of a brick before placing it in position.
Buttering trowel. (Masonry) Used for spreading mortar on the brick before it is laid.
Butter-nut. (wood) A medium-sized tree native to eastern United States. Wood is soft and porous. Used for furniture and interior finishing.
Butt hinge. (Carp.) A hinge secured to the edge of a door and the face of the jamb which butts against the edge of the door when it is shut, as distinguished from strap hinge.
Butting or butt ramming. (Fdry.) Ramming with the flat surface of the round end of the ram mer.
Butt joint. (Arch. and Woodwk.) Where the ends of two pieces of timber come together without over lapping.
Butt miter. (Sheet-Met. Wk.) A miter joint in which the pieces to be joined do not overlap.
Button machine. (Uphol.) A small, hand-operated machine equipped with upper and lower dies. It may be used for attaching buttons or, by c;1anging the attachments, may be used for attaching snap fasteners, eyelets, etc.
Button-wood. (See Sycamore).
Butt tamming. (Fdry.) Ramming done with the butt or large round end of the rammer.
Buttress, flying. (A rch.) A detached buttress or pier of masonry at some distance from a wall and connected
thereto by an arch or a portion of an arch.
Buttress thread. (Mach.) A screw thread which is triangular in section but which has one face at right angles to the axis of the screw, the second face only being sloped. Used in cases where excessive shock must be absorbed, as in the breech block of a cannon.
Butt welding. (Forg. and Shopwk.) A weld in which the two pieces to be connected do not overlap but are welded directly at their ends; a common method of welding rods by an electric process.
Buzzer. (Elec.) An electric call signal which makes a buzzing noise caused by the rapid vibrations of the armature. It operates on the same principle as the vibrating bell.
Buzz saw. (Woodwk.) A name often applied to a circular saw.
By-pass. (Plumb.) Any method by which water may pass around a fixture, appliance, connection, or length of pipe. Sometimes incorrectly applied to a connection between a drain pipe and a vent pipe which allows sewer air to enter the building.
By-pass. Commonly applied to a capacitor connected in parallel with another component or circllit in order to by-pass a.c. signal currents via i~ own reatively low reactance.
An alternate signal path that goes around a given circuit. A "hard wire" bypass uses a switch and a piece of wire to .route the signal from the input to the output of a device. A "by-pass" switch is sometimes called an "In-Out" switch.
Byte. A byte in magnetic tape recording is a sub unit of a computer data word and is equal to the number of data bits recorded across the width of the tape, usually 6 to 8 bits.
"
|
